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--- a/src/aspell/rclaspell.h
+++ b/src/aspell/rclaspell.h
@@ -50,7 +50,7 @@
     ~Aspell();
 
     /** Check health */
-    bool ok();
+    bool ok() const;
 
     /** Find the aspell command and shared library, init function pointers */
     bool init(string &reason);